Cross-arm for electrical construction.



PATENTED DEC, 18, 1906.

E. s. HAMILTON.

GROSS ARM FOR ELECTRICAL CONSTRUCTION.

APPLIOATION TILED APR. 9, 1906.

UNITED STATES PATENT OFFICE.

CROSS-ARM FOR ELECTRICAL CONSTRUCTION.

1&0. 838,537.

Specification of Letters Patent.

Batented Dec. 18, 1906.

Application filed Apri19, 1906. Serial No. 310,692.

T0 at whowt it may concern:

Be it known that I, EVLYN S. HAMILTON, a citizen of the United States, residing at Adrian, county of Lenawee, State of Michigan, have invented a certain new and useful Improvement in Cross-Arms for Electrical Construction, of which the following is a specification, reference'being had to the accompanying drawings, which form a part of this specification.

My invention has for its object a novel cross-arm for electrical construction; and it consists of the mechanism hereinafter described and claimed, and illustrated in the accompanying drawings, in which Figure 1 is a view in side elevation illustrating my invention. Fig. 2 is a view in section through one of the sustaining-sockets on the line 2 2, Fig. 1. Fig. 3 is a detail view showing one of the hooks with a line-wire secured in place thereupon. Fig. 4 is a view similar to Fig. 2, certain parts being omitted.

My invention is designed to provide a metal cross-arm having integral underhanging sustaining-sockets and upwardly-extended insulator-supporting arms.

I carry out my invention as follows:

In the drawings, a represents the body of the cross-bar, which is formed of angle-iron or metal of angular form, rovided at intervals with upwardly-exten ing insulator-su porting arms I), said arms united also with t e body by means of strengthening ribs or yokes c. When these ribs or yokes are located adjacent to the said arms, they not only help to support the arms, but a special feature of their use is to brace the body of the cross-arm against torsional strain, and the yokes or braces'might therefore be located at any desired points within the scope of my invention. For example, a rib or yoke is shown intermediate the extremities of the crossarm through which is formed a hole or orifice e for receiving a bolt to unite the cross-arm upon a pole. I have also shown'brace-arms f f converging upwardly, as shown, and provided with bolt-orifice g, through which a bolt may be engaged in the pole, said bracearms serving to stiffen the union of the crossarm upon the pole and counteract lateral strain. These brace-arms might be led outward farther toward the extremities of the cross arm, if desired. These braces are formed in my invention as integral parts of the cross-arm. The upwardly-extended supporting-arms are shown threaded to receive insulators h.

From the under side of the body of the cross-arm depend sustaining-sockets i,

formed integrally with the body, said sus- 2 taining-sockets being preferably interiorly threaded, as shown at y', and in which sockets are suitably engaged supporting-hooks 76, having threaded shanks, as shown. These hooks are constructed also with outwardlyprojecting shoulders I and m to support tiewires 01 for holding the line-wires g from displacement in the hooks. I do not limit myself solely to the formation of the hooks with said shoulders, as the hooks may be provided with other suitable means of supporting the tie-wires within the scope of my invention. The shoulders are so arranged that the tiewire will engage under the one and over the other, as shown in Fig. 3. The lateral edges of the hook are also preferably grooved, as indicated at n, to further receive the tie-wire. I have shown the hooks engaged in the sustaining-sockets by an intermediate insulator 1", threaded into the socket and into which the shank of the hook is threaded. The insulators are preferably constructed so as to have a skirt effect. Between the shank of the hook and the insulator I have also shown a yielding substance sas of felt, for exampleto diminish the liability of breaking the insulator.

A cross-arm so constructedprovided with yokes or ribs to resist torsional strain, with upwardly projecting insulator arms, with braces to resist lateral strain, with downwardly-projecting sustaining-sockets, is be lieved to be novel and its superior utility and sufficiency is obvious, the cross-arm, with its yokes or ribs, upwardly-extending pins or arms, braces, and downwardly-projecting sustaining-sockets, being formed in a single integral piece.

What I claim as my invention is 1. A metallic supporting cross-arm for 100 electrical construction comprising a body of angular form 1n cross-section, having a series .of yokes or ribs to resist torsional strain, a

series of upwardlyprojecting insulator-supporting arms or pins, and a serles of sustain 1o 5 ing-sockets projecting downwardly from the under side of the body.

2. A. metallic supporting crossarm for electrical construction comprising a body of angular form in cross-section, having a series I 10 of yokes or ribs to resist torsional strain, a series of upwardly-projecting insulator-supporting arms or pins, and a series of internally-threaded sustaining-sockets projecting downwardly from the under side of the body.

3. A metallic supporting cross-arm for electrical construction comprising a body of angular form in cross-section, having a series of yokes or ribs to resist torsional strain, a series of upwardly-projecting insulatorsup porting arms or pins, and a series of sustaining-sockets projecting downwardly from the under side of the body, all constructed in a single integral piece.

4. A metallic supporting crossarm for electrical construction comprising a body of angular form in cross-section, having a series of yokes or ribs to resist torsional strain, a series of upwardly-projccting insulator-supporting arms or pins, and a series of sustaining-sockets projecting downwardly from the under side of the body, and a line-wire-sustaining device engaged in said sustainingsockets.

5. A metallic supporting cross-arm for electrical construction comprising a body of angular form in cross-section, having a series of yokes or ribs to resist torsional strain, a series of upwardly-projecting insulator-supporting arms or pins, a series of sustainingsockets projecting downwardly from the under side of the body and line-wire-sustaining devices engaged in said sockets, said devices having threaded shanks.

('3. A metallic supporting crossarm for electrical construction comprising a body oi? angular form in cross-section, having a series of yokes or ribs to resist torsional strain, a series of upwardly-projecting insulatorsup porting arms or pins, and a series o'l sustaining-sockets projecting dmvnwardly from the under side of the body, and a line-wire-sustaining device engaged in said sustainingsockets, said devices constructed with means to support tie wires to hold the line-wires in position.

7. A metallic supporting cross-arm for electrical construction comprising a body of angular form in cross-section, having a series of yokes or ribs to resist torsional strain, a series of upwardly-projecting insulator-supporting arms or pins, and a series ol sustaining-sockets projecting dmvmvarrlly from the under side of the body, and braces to resist lateral strain, all constriuwted in a single integral piece.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

EVLYN S. HAA'HIIION.

Htnesses:

N. S. VVnron'r, E. M. SPIELBURG. 

